Heating furnace



J. HELMKEE HEATING FURNACE Filed Jan. 10, 1920 3 Sheets-Sheet l ATTORNEYJ. HELMKEE HEATING FURNACE 3 Sheets-Sheet 3 Filed Jan. 10 1920- Jacob He[m kee lNVE/VTOR.

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Q Q Wm ATTORNEY $2505 Heinz fere A TTORNEY Patented Nov. 13, 19.23

g i fit l fl JACOB HELIVIKEE, F KENFIORE, CHIC, ASSIGNOR TO 3. H. LACROIX,

OF CLEVELAND,

OHIO.

HEATING FURNACE. v

Application filed January 10, 1920.

To all whom 2'25 may concern:

Be it known that I, J-ACOB Hnnarxnn, a citizen of the United States,residing at Kenmore, in the county of Summit and State of Ohio, haveinvented new and useful lmprovements in Heating Furnaces, of which thefollowing is a specification.

The present invention has particular reference to a. heating furnacewherein cold air entering a casing surrounding a firebox, is adaptedtobe directed over the firebox and into contact with the exteriorsurfaces of smoke flues to be heated thereby with the heated airdirected through conveying pipes to suitable points of discharge.

A further object of the invention is to provide a heating furnace of thehot air type wherein the combustion and smoke tubes over which the airto be heated is di rected, are located above the firebox, so that heatradiating from the fire box will, in addition to heating the airsurrounding the firebox, heat the exterior walls of the fines andadjacent currents of air to increase the heating capacity of thefurnace.

With the above and other objects in view, the invention consists in thenovel form, combination and arrangement of parts here in fully describedand shown in the accoin- 30 panying drawings wherein like referencecharacters indicate similar parts throughout the several views.

In the drawings,

Figure 1 is a perspective view of a furnace constructed in accordancewith the present invention, with a portion of the outer casing beingbroken away to illustrate the inner firebox and smoke flues superposedthereon,

Figure 2 is a vertical cross sectional view taken on line 22 of Figure1, and

Figure 3 is a vertical cross sectional view taken on line 33 of Figure2.

The present invention has particular ref-- erence to a hot air furnace,the same embodying an outer easing into which the cold air is directedfor circulation about the firebox positioned within the casing, whilesmoke lines are superposed upon the firebox and have communication withthe upper end of the firebox whereby the smoke and products ofcombustion are caused to travel in a tortuous path over the top of thefirebox and through the fines, while pipe sections are connected to theupper cut of the outer casing of the furnace for supplying Serial Ho. 350,663.

heated air to the desired points, the gist of the present inventionprincipally residing in t 1e detailed construction of the flue structuresuperposed upon the firebox.

Describing the invention more in detail, there is provided an outercasing l, prefer ably cylindrical in form including a bottom wall ormounting base 5 while a cover (3 of depressed formation closes the upperend of the casing l. A cold air pipe 7 communicates with the lower endof the casing 4.- as clearly illustrated in Figures 1 and 2, while hotair delivery pipes 8 are connected to the upper end of the casing forconveying the heated air to desired points.

The firebox i cludes a casing 9 enclosed within the outer casing 41 andspaced from the walls thereof to afford a free unobstruct ed passageatthe lower end of the casing for air entering the pipe 7, while asillustrated in Figures 1 and 2, the firebox 9 is accessible through themedium of the door 10 carried by the outer casing with the chute 11extending between the casing 4 and firebox 9 for directing the fuel intothe firebox 9 for reception upon the grate bars 12.

The grate bars 12 have end extensions 12 for seating in sockets 13 inthe side walls of the firebox 9, the grate bars 12 being of theconstruction more clearly shown in Figures 2 and 3 with passagewaysthrough each grate bar, while each bar has a depending pin 14 extendingthrough a shaker bar 15 operated by the arm 16 which in turn is shiftedby the operating handle 17 as shownin Figures 1 and 2, while ashesfalling into the pit 18 are removable through the chute 19 and the ashdoor 20.

The upper end of the firebox 9 is-protected with a cover wall 9 spaced aconsiderable distance from the cover 6 of the casing a while the rearwall of the firebox 9 is provided with a pair of smoke passage openings21 therein. A rear smoke box has communication with the firebox openings21 and includes a pair of spaced plates 22 having opposed flanges 23upon the inner faces thereof which support a band section 2% forming aspacing element for the plates 22,

while said plates are held immovable relative to the band 2% by bolts 25passing through ears 26 formed on the edges of said plates 22, the smokebox embodying the plates 22 being secured to the firebox 9 by bolts 27passing through the ears 26 and ears 28 formed on adjacent portions ofthe firebox 9. As i lustrated in Figure 2, the pipe sections 29 extendbetween firebox openings 21 and the plates so that the passage betweensaid smoke box and the firebox is established. The upper end of theinner plate 22 is preferably provided with three flanged openings 30,each having communication with a separate line 31, the forward ends ofthe fines 31 being connected to a forward smoke box embodying plates 32and 3?) having opposed flanges ill with the spacing band 35 cooperatingwith said flanges to hold the plates 32 and 33 in spaced relation, thewall 32 of the smoke box bein provided with three horizontally alinedflanged openings 36 for the reception of the forward ends of the tines31. Three fines 37 are superposed relative to the lines 31 and areconnected at their forward ends to the flanged openings 38 formed in theupper end of the plate 32, while the rear ends of said fines 37 extendinto flanged openings 39 in a rear smoke box +210 identical inconstruction to the smoke box previously described, the smoke box -10being superposed upon the side plates 22 of the smoke box havingcommunication with the firebox 9. A smoke pipe ll forms communicationbetween the smoke box 40 and a stack or other outlet for establishing acontinuous passage from the firebox 9 to the atn'rosphere.

In order to obtain access tot-he fines 31 and 37 for 'prn'poses 'ofcleaning the same, or for the repairing of any nature, there is providedan enlarged opening 4-2 in the forward wall '33 of the front smoke box.which opening is surrounded by an outwardly directed flange -l3. Acorresponding opening is provided in the front wall of the furnacecasing a and receives the closure cap llclosing said opening andreceived on the fiange 43 with the closure cap forming a component partof the smoke box, increasing the area thereof and lying in the path oftravel of the air to be heated. As more clearly illustrated in Figures 1and 2, the walls 32 and 33 of the front smoke box are provided withcooperating peripheral ears 4:5 to receive retaining bolts 46, whilesimilar bolts 47 extend between ears L8 upon the walls of the smoke box40. The smoke boxes above described are retained in position withrespect to the lues '31 and 37 and immovable relative thereto byconnecting rods l9 extending between ears 26 and at?) of the plates 22and 32 and the ears lo'and 4-8 of the plate 32 and smoke box 40. '1 heforward smoke box is supported upon the upper wall 9 of the fireboxby'depending feet 50.

From the above detailed description of the invention. it is believedthat the construction and operation thereof will be at once apparent, itbeing understood that the smoke and products of combustion within therear smoke box 40 and thence to the out- 7 letpipe section ll fordischarge into a stack or the like. The cold air entering the pipe 7contacts the firebox 9 and absorbs heat therefrom and is directedupwardly over the firebox and into contact with the fines 31 and 37 andthe smoke boxes above described, and when heated passes into thedelivery pipes S for discharge at desired points. The gist of thepresent invention principally resides in the formation of the fines 31and 37 and the manner of supporting the same upon the firebox 9.

.Vhile there is herein shown and described the preferred embodiment ofthe invention, it is nevertheless to be understood that minor changesmay be made in the form, combination and arrangement of parts Withoutdeparting from the spirit and scope of the invention as hereinafterclaimed.

What I claim as new is 1. A furnace of the class described, comprisingin combination, a tire box, an outer casing, horizontal fines leadingfrom the rear wall of said firebox at a point adj acent the upper edgethereof, asmoke box located within said casing and connecting the endsof said fines, said smoke box positioned in spaced relation to the rearWall and projecting upwardly above the plane of the upper wall of saidfire box, a second smoke box detachably mounted on the upper wall ofsaid fire box, a plurality of fines leading from the first named smokebox thereto; a third smoke box detachably mounted on the first namedsmoke box, a plurality of fines leading from the second smoke boxthereto and a single flue leading from the last named smoke box.

2. A furnace comprising in combination. a fire box, an outer casing, aplurality-"of parallelly disposed horizontal lines leading from the rearwall of said fire box at points adjacent the u 3})61 edge thereof, asmoke box located within said casing and connecting the ends of saidfines, said smoke box positioned in spaced relation to said rear walland projecting upwardly above the plane of the upper wall of said firebox, means to secure said smoke box to the fire :box, an independentlyformed second smoke box detachably mounted on the upper wall of saidfire box, a plurality of parallelly disposed fines leading from thefirst named smoke box thereto, a third smoke box detach'ably mounted onthe first named smoke box, ahplurality of parallelly disposed finesleading from the second smoke box thereto; and a single flue leadingfrom the last named smoke box, each of said smoke boxes located whollywithin the casing, substantially as and for the purpose set forth.

3. A furnace of the type described comprising in combination a casing,air inlet and outlet means therefor, a firebox within the casing, aplurality of smoke fines arranged above said firebox in superposedrelation independently formed, smoke boxes connecting the adjacent endsof said flues, means forming communication between the fire box and oneof said smoke boxes, smoke outlet means connected with one of said smokeboxes, each of said smoke boxes comprising a pair of spaced plates bandsarranged between said plates for holding the same in spaced relation,ears formed upon said smoke box plates, connecting means between saidears, connecting means between cooperating ears formed on the innerplates of the smoke boxes at the opposite ends of the fines, and aremovable closure cap for one of said boxes lying in the path of travelof the air to be heated.

In testimony whereof I have hereunto set my hand.

JACOB HELMKEE.

